/* $OpenBSD: setjmp.S,v 1.8 2005/08/07 11:30:38 espie Exp $ */
/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <machine/asm.h>

/*
 * C library -- setjmp, longjmp
 *
 *	longjmp(a,v)
 * will generate a "return(v)" from the last call to
 *	setjmp(a)
 * by restoring registers from the stack.
 * The previous signal state is restored.
 */

#define NACL_BLOCK_SHIFT        4

    .text
    .align NACL_BLOCK_SHIFT
    .globl setjmp

setjmp:
  mov    %edi, %edi
  mov    %rbx, (%r15,%rdi,1)
  mov    %edi, %edi
  mov    %r12, 0x08(%r15,%rdi,1)
  mov    %edi, %edi
  mov    %r13, 0x10(%r15,%rdi,1)
  mov    %edi, %edi
  mov    %r14, 0x18(%r15,%rdi,1)
  mov    (%rsp), %rax
  nop
  mov    %edi, %edi
  mov    %rax, 0x20(%r15,%rdi,1)
  lea    0x08(%rsp), %rax
  mov    %edi, %edi
  mov    %ebp, 0x28(%r15,%rdi,1)
  mov    %edi, %edi
  mov    %eax, 0x2c(%r15,%rdi,1)
  nopw   0x00(%rax,%rax,1)
  mov    $0x0, %rax
  pop    %r11
  and    $0xffffffe0, %r11d
  add    %r15, %r11
  jmpq   *%r11


    .text
    .align NACL_BLOCK_SHIFT
    .globl longjmp

longjmp:
  mov    %rsi,%rax
  mov    %edi,%edi
  mov    0x28(%r15,%rdi,1),%ebp
  add    %r15,%rbp
  mov    %edi,%edi
  mov    0x2c(%r15,%rdi,1),%esp
  add    %r15,%rsp
  mov    %edi,%edi
  pushq  0x20(%r15,%rdi,1)
  mov    %edi,%edi
  mov    (%r15,%rdi,1),%rbx
  mov    %edi,%edi
  mov    0x8(%r15,%rdi,1),%r12
  xchg   %ax,%ax
  mov    %edi,%edi
  mov    0x10(%r15,%rdi,1),%r13
  mov    %edi,%edi
  mov    0x18(%r15,%rdi,1),%r14
  pop    %r11
  and    $0xffffffe0,%r11d
  add    %r15,%r11
  jmpq   *%r11
  nop
  nop
